<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <script src="https://cdn.jsdelivr.net/npm/vue@2.6.10/dist/vue.js"></script>
    <title>Document</title>
</head>
<body>
    <div id="app">
       <button @click="dosmthing.push({id:4, content:'打篮球'})">添加</button>
        <ul>
            <li v-for="(item,index) of dosmthing" :key="item.id">
                <p>编号:{{item.id}}</p>
                <p>{{item.content}}</p>
            </li>
        </ul>


    </div>
    <script>
        Vue.config.productionTip = false

        const vm = new Vue({
            el:'#app',
            data(){
                return{
                    dosmthing: [
                        { id: "1", content: "吃饭" },
                        { id: "2", content: "睡觉" },
                        { id: "3", content: "打游戏" },
                    ],
                }
            }
        })
    </script>
</body>
</html>